Testosterone Therapy Today: Fertility, Prostate Cancer & Heart Health Explained

Dernière mise à jour : 18 juillet 2026

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Testosterone therapy is one of the most talked-about — and most misunderstood — topics in men’s health today. Should a young man take it if he wants to have children? Is it dangerous for someone who has had prostate cancer? Will it cause a heart attack? These are real questions I hear from patients every week, and the answers have changed dramatically in recent years.

In May 2026, I had the privilege of shadowing Professor Mohit Khera — a globally respected leader in men’s health — at the American Urological Association (AUA) 2026 meeting in Washington, DC. One of the most memorable sessions was a series of real-world testosterone case discussions led by world-renowned experts. In this article, I’ll share three of those cases in plain language, because they perfectly capture how modern medicine is replacing old fears with smart, personalized care.

Case 1: The Young Man Who Wanted Both Energy and a Baby

The first case involved a man in his late thirties who was newly married and trying to start a family with his wife. He was struggling with severe erectile dysfunction, low energy, and very low libido. His blood tests showed strikingly low testosterone. He also had several health conditions — obesity, diabetes, and sleep apnea — that commonly drag testosterone down.

Here’s the crucial twist: he desperately wanted to feel better, but he was also actively trying to conceive. And this is where many people get surprised.

Why Standard Testosterone Was Off the Table

It seems logical that a man with low testosterone should simply be given testosterone. But for a man trying to have children, standard testosterone therapy is actually forbidden. The reason is a feedback loop in the body: when you take testosterone from an outside source, the brain senses there’s plenty around and switches off the signals that tell the testicles to keep working. This shutdown halts sperm production — effectively causing temporary infertility. For a couple trying to conceive, that’s the opposite of what they want.

The Smarter Solution

Instead of giving testosterone directly, doctors use medications that encourage the body to make its own testosterone while keeping sperm production intact. One common option is clomiphene, a pill that nudges the brain into sending stronger signals to the testicles.

But the case revealed a fascinating real-world lesson. Even though clomiphene raised the patient’s testosterone numbers beautifully on paper, he still didn’t feel much better — his energy and libido stayed low. As one of the expert panelists, Dr. Larry Lipshultz, explained, this is surprisingly common: clomiphene is great at improving the lab numbers, but a meaningful number of men just don’t notice the symptom relief they hoped for. He shared two refinements that often work better:

• Enclomiphene — a purified version of clomiphene that avoids some of the estrogen-related side effects, often giving men noticeably better symptom relief.
• hCG injections — because the patient’s testicles clearly responded well, they were proven to be fully functional. hCG directly mimics the body’s natural signal to the testicles, often producing excellent results in both how a man feels and protecting his fertility at the same time.

The takeaway: For younger men who want to preserve fertility, there are excellent alternatives to standard testosterone — and the goal isn’t just better numbers, it’s helping the patient genuinely feel better.

Case 2: Testosterone After Prostate Cancer — Breaking an Old Fear

The second case tackled one of the most emotionally charged questions in urology: Is it safe to give testosterone to a man who has had prostate cancer?

The patient was a man in his late fifties who had been successfully treated for high-risk prostate cancer a few years earlier. His cancer was in remission, but he was suffering badly — crushing fatigue, very low libido, depression, and erectile dysfunction. His testosterone was extremely low, and his quality of life had collapsed.

“Pouring Gasoline on a Fire”? Not Anymore

For decades, doctors believed that giving testosterone to a prostate cancer survivor was like pouring gasoline on a fire — a guaranteed way to make the cancer roar back. But modern science has overturned this idea through what’s called the Saturation Model.

In simple terms: prostate tissue only responds to testosterone up to a certain point. Think of it like a sponge that can only hold so much water. Once the prostate’s receptors are “full” — which happens at a relatively low testosterone level — adding more testosterone doesn’t fuel any extra growth. This insight opened the door to safely treating symptomatic men who previously would have been left to suffer.

The experts also agreed on an important practical point: while honest, thorough counseling about the unknowns is absolutely essential, there’s no need to perform a routine prostate re-biopsy before starting treatment in these carefully selected patients.

Reading the Warning Signs Correctly

After starting testosterone, the patient’s PSA (a blood marker for prostate activity) ticked up slightly. This caused understandable panic for both the patient and his cancer doctor. But the experts smiled knowingly — this small early rise is completely expected. As testosterone climbs from a very low level up toward that “saturation point,” the normal remaining prostate tissue simply wakes up and responds. It does not mean the cancer is back.

His symptoms improved dramatically, and his PSA settled at a stable, reassuring level. However, about a year later, his PSA suddenly jumped much higher — far beyond what the saturation effect could explain. This was a genuine red flag. Advanced imaging confirmed a true cancer recurrence in a nearby lymph node.

The profound lesson here: the testosterone did not cause the cancer to come back. Given his original high-risk cancer, a microscopic recurrence was already destined to happen. The therapy simply revealed it. This is why expert monitoring is so important — it lets doctors tell the difference between a harmless expected bump and a real warning sign. Even the official AUA guidelines now recognize testosterone therapy as a reasonable option for symptom relief in select prostate cancer survivors, under careful expert supervision.

Case 3: Protecting the Heart — and Avoiding a Hidden Side Effect

The final case is one almost every doctor sees regularly: an older man with low testosterone and a complicated heart history. This patient was in his early sixties with low energy, low libido, and ED. He also had high blood pressure, obesity, coronary artery disease, and had undergone major open-heart bypass surgery a few years earlier. His father had died of a heart attack at a young age.

Understandably, he was terrified. He asked the question on every cardiac patient’s mind: “Will testosterone increase my risk of another heart attack?”

What the Science Now Says About TRT and the Heart

For years, the medical world was split on this, largely because of some flawed older studies that hinted testosterone might raise heart risks. But a major, carefully designed study known as the TRAVERSE trial changed everything. It was specifically built to test cardiovascular safety in men who already had heart disease or high heart risk — and it clearly showed that properly managed testosterone therapy does not increase the risk of major heart events compared to placebo.

Interestingly, the panel had a healthy debate. Some experts preferred a cautious approach — focusing first on weight loss, quitting smoking, and lifestyle changes, since his testosterone was only borderline low. Others, echoing a cardiologist on the official guideline panel, pointed out something important: leaving low testosterone untreated is itself a risk factor for worsening heart disease and metabolic problems. In other words, treating it could actually help protect his heart.

Busting the BPH Myth

The patient also worried that testosterone would worsen his urinary symptoms from an enlarged prostate (BPH) — a fear reinforced by scary warning labels. The panel quickly put this myth to rest. Modern evidence shows that restoring testosterone to normal levels does not worsen urinary symptoms. In fact, by improving blood flow and reducing inflammation, some men actually notice mild improvement.

The Thick Blood Problem — and an Elegant Fix

The patient chose to start treatment with standard weekly testosterone injections and felt fantastic — more energy, sharper thinking, and a much better sex life. But a routine safety blood test revealed a problem: his blood was becoming too thick (a condition called erythrocytosis), where the body produces too many red blood cells. For a man with multiple heart bypasses, thick, sticky blood that could form clots is genuinely dangerous.

Here Dr. Lipshultz shared another brilliant, practical tip. The big spikes in testosterone caused by standard weekly injections are the main trigger for this overproduction of red blood cells. The solution isn’t to stop the therapy that transformed his life — it’s to change how it’s delivered. By switching to small, frequent under-the-skin (subcutaneous) micro-doses — using a tiny insulin-style needle a couple of times a week — the testosterone level stays smooth and steady instead of spiking. In his experience, this simple change reliably brings the blood count back to normal while keeping all the benefits.

The Big Picture: From Fear to Personalized Care

What struck me most about these case discussions was how far the field has come. The modern approach to testosterone therapy has moved away from rigid, fear-based rules and toward precise, evidence-based, individualized care.

Today’s urologists are no longer paralyzed by outdated myths about prostate cancer or heart risk. Armed with strong science like the Saturation Model and the TRAVERSE trial, they can confidently restore energy, confidence, and quality of life — even in complex patients — while using smart tools like enclomiphene, hCG, and subcutaneous micro-dosing to protect fertility and minimize side effects. Leaving Washington, DC, I felt genuinely inspired by how much better we can now care for men who once would have been told simply to live with their symptoms.

All three cases share one theme: the right answer depends on the individual, not on a blanket rule. A TRT consultation at Bangkok Hospital is built around that same case-by-case assessment.

If you are experiencing symptoms of low testosterone — such as low energy, low libido, mood changes, or erectile dysfunction — and would like a comprehensive, up-to-date evaluation, Dr. Soarawee Weerasopone offers specialist consultations in men’s health at Bangkok Hospital Headquarters. Prendre rendez-vous.

Foire aux questions (FAQ)

Can I take testosterone therapy if I want to have children?

Standard testosterone therapy is not recommended for men who are actively trying to conceive, because it signals the brain to shut down the body’s natural sperm production, which can cause temporary infertility. Instead, doctors use fertility-preserving alternatives such as clomiphene, enclomiphene, or hCG injections. These stimulate the body to produce its own testosterone while protecting sperm production, allowing men to improve their symptoms and preserve fertility at the same time.

Is testosterone therapy safe after prostate cancer?

Modern research has changed the old belief that testosterone fuels prostate cancer. According to the Saturation Model, prostate tissue only responds to testosterone up to a certain low threshold; beyond that point, additional testosterone does not stimulate further growth. For carefully selected prostate cancer survivors with low testosterone and severe symptoms, testosterone therapy can be a reasonable option for symptom relief under strict expert monitoring, as recognized by current AUA guidelines. Thorough counseling and regular PSA surveillance are essential.

Does testosterone therapy increase the risk of heart attack?

No. The landmark TRAVERSE trial, a large and rigorous study designed specifically to test cardiovascular safety in men with existing heart disease or high heart risk, found that properly managed testosterone therapy does not increase the risk of major cardiac events compared to placebo. In fact, untreated low testosterone is itself associated with worse heart and metabolic health, so treatment may even support cardiovascular wellbeing in appropriate patients.

Does testosterone therapy make an enlarged prostate (BPH) worse?

This is a common myth. Current evidence shows that restoring testosterone to normal physiological levels does not worsen urinary symptoms or benign prostatic hyperplasia (BPH). By improving blood flow and reducing inflammation, some men actually experience a mild improvement in their voiding symptoms while on therapy.

Why does testosterone therapy sometimes thicken the blood, and how is it managed?

Standard weekly intramuscular testosterone injections cause large spikes in testosterone, which can overstimulate red blood cell production and thicken the blood (a condition called erythrocytosis). This can be safely managed by switching to low-dose, frequent subcutaneous (under-the-skin) micro-dosing, which keeps testosterone levels smooth and steady. This approach typically normalizes the blood count while preserving all the benefits of therapy.

Avis de non-responsabilité : Ce contenu est rédigé et revu par le Dr Soarawee Weerasopone, urologue certifié au siège de Bangkok Hospital. Il est destiné uniquement à des fins éducatives et ne constitue pas un avis médical. Consultez toujours un professionnel de la santé qualifié avant de commencer tout traitement médical.